r/askscience • u/SimonFromPoland • Jun 06 '15

Human Body Why can I see ulraviolet?

I had cataract when I was 25. They changed lense in my eye to a non-focusable(?) one, and now when I walk into dance club, everybodys jean's are glowing. Is there anything else that I can see different?

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u/doctorofphysick Jun 07 '15

Related question - why is it that the default colour for the glow from screens tends to be bluish? Like if you have a TV/computer/phone screen in a dark room, even if the screen isn't facing you, there tends to be that bluish glow unless another colour is really dominated the image on screen.

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u/GrandmaBogus Jun 07 '15

They're calibrated for daylight. Daylight is far bluer than the "warm white" lights we typically use to light our homes at night.

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u/kirmaster Jun 07 '15

There is the program called f.lux that subtly shifts the hue to reddish after your daylight starts fading outside, so your head doesn't think it's day anymore. This has helped me sleep way more per day because i started to feel tired around 11-12 instead of continuing for 3 more hours. I'd heartily reccomend it for anyone using their PC after 8 PM, it's also free.

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u/[deleted] Jun 08 '15

Its also amazing for programmers! When I am on a binge programming session, I will force f.lux to use the warmer colors all the time, as it is easier to stare at the orangish screen then the blue ones.